Mr. Rewrite will get to the sign in a second, but he wants to discuss how difficult it was to come up with that headline. Wacky baccy, tobaccy, tobacky, tabacky, etc., etc., is, of course, slang for marijuana. But there's no good reference providing the correct handling of the second part. He went with tabaccy because one resource listed baccy as a dated nickname for tobacco.
Anyway, this isn't the first sign Mr. Rewrite has seen misspelling tobacco as tabacco (he found the one below nearby). He suspects it's because the Spanish word for tobacco is tabaco. If someone has a better theory -- other than the decline of the U.S. education system -- please chime in.